📁 建筑与维护
The Construction and Maintenance sector category includes resources on industries and companies primarily engaged in the design and construction of buildings and other structures, heavy construction (e.g. such as highways, power plants, and pipelines), additions, alterations, reconstruction, installation, and maintenance and repairs. Demolition or wrecking of buildings and other structures, clearing of building sites, and sale of materials from demolished structures are also included. Finally, industries and companies that manufacture and distribute construction supplies and equipment are included in this branch. This category also includes information resources covering these industries, such as associations, reference resources, news, etc. (Source: This category description is based on the North American Industry Classification System (NAICS), 1997).